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The IKEA Myggbett contact sensor is getting a lot of attention among home automation enthusiasts, not just for its Matter-over-Thread support, but for its ground-breaking low price. I couldn't resist picking one up.
Adding it to HomeKit was a breeze, but the design of the sensor prevented it from being mounted on my door in the manner illustrated in the IKEA instructions. (And of course it was illustrated! I love their instructional design.)
I did eventually find a single way to position both pieces in a way that works and fits my door's frame. Note the relative positions of the button and detent in the photo below. And be sure to test that the distance between the pieces activates the sensor, before you mount them into place.
I'm finding that the sensor reacts quickly, but I'm also getting several spurious signals every day. I suspect that it's because I don't have a Thread border router device to receive the battery-powered sensor's signals. (In other words, my Thread mesh consists of just this one device.) I'll add another Mater-over-Thread device and see if that resolves the problem. Nonetheless, given the low cost of this sensor, I'm mostly satisfied, and I'll explore other devices in the IKEA range as I discover uses for them.